Orkut was wildly successful in Brazil and India, until they stopped building it for Buzz and Plus
Reader was hugely successful, which is why the outcry on its closing
Chromebooks are doing great, atleast on Amazon, the world's biggest retailer.
Dart pivoted into a compile-to-JS language, but is still alive
Motorola streamlined it's product lineup under Google and is doing fairly okay for Lenovo
Calling above items as failure is inaccurate. None of them were moonshots btw.